Expert's Opinion

NREL Windows Research Clearly Making a Difference

Poorly performing windows drive up energy costs as a building’s HVAC system attempts to overcome too much heat escaping or too much cold entering.

Anyone who has ever sat next to a drafty window on cold days knows misery. Anyone who has ever worked in a windowless office knows despair. “Windows are enormously important to the way we experience the indoor environment,” said Chioke Harris, a researcher in the National Renewable Energy Laboratory’s (NREL’s) Building Energy Science Group. “Windows have an enormous effect on the well-being of building occupants. Given the amount of time people spend indoors, windows have just an outsized inf...

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